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Mathematics 9 Online
OpenStudy (anonymous):

find a second order deferential equation for which the following function are solution cosx,sinx

OpenStudy (jamesj):

What's the second derivative of cos x and sin x ? I.e., if y = cos x, what is y'' ? Now express that as a function of y. I.e., y'' = f(y). You'll find it's very straight-forward. Very.

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